Disable reverse dns lookup

The BaseHTTPServer will do a reverse dns lookup when log message, which
will cause 10 seconds latency in some network environment. This will
significantly slow down the api request when wsgiref.simple_server is
used.

This patch creates a class, which inherits from
simple_server.WSGIRequestHandler but overrides address_string method,
and passes it to handler_class param of simple_server.make_server.

Change-Id: Ia38c7719ed700ab5867dcc4bcf3700bff282a907
Closes-Bug: #1291229